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fixtures.reorder_items performs poorly for large numbers of parametrized fixtures #3107

cheezman34 opened this issue Jan 11, 2018 · 4 comments


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@cheezman34 cheezman34 commented Jan 11, 2018

If a parametrized fixture generates n items, then reorder_items will have roughly O(n^2) performance. Slice items is called for each item and then iterates over the list of items to find matching groups. We can improve this by pre-caching items by fixture (like argkeys_cache but in reverse).

I've already got code ready for a pull request, I'm just making this issue for record-keeping / discussion.

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@pytestbot pytestbot commented Jan 11, 2018 thinks the contributor most likely able to help you is @RonnyPfannschmidt.

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@RonnyPfannschmidt RonnyPfannschmidt commented Jan 11, 2018

thanks for doing all the things in a very detail oriented manner, for personal reasons i wont be able to give it the time it deserves until next week

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@edmorley edmorley commented Jan 31, 2018

For anyone who arrived here from the changelog, the fix for this landed in #3108.
(This issue can now be closed)

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@nicoddemus nicoddemus commented Jan 31, 2018

Thanks @edmorley!

@nicoddemus nicoddemus closed this Jan 31, 2018
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